решите, все заранее большая ! : )

1) -3x + 2 = -8x + 7 + 5x

-3х + 8х - 5х = 7 - 2

0х = 5

ответ: ∅

2) 5 - 3(x + 7) = 8x - 6x - 8

5 - 3x - 21 = 2x - 8

-3x - 2x = -8 - 5 +21

-5x = 8

x = -1,6

3) (9x - 2)(3x + 27) = 0

27x² + 243x - 6x - 54 = 0

27x² + 237x - 54 = 0

D = 56169 + 5832 = 62001

4) 5 - (6x - 2) = 7x + (-3x + 1)

5 - 6x + 2 - 7x + 3x - 1 = 0

-10x + 6 = 0

-10x = -6

x = 0,6

5)  x(x + 25)=0

x₁ = 0

x₂ = -25